package com.blog.sys.common.utils;

import cn.hutool.core.convert.Convert;
import cn.hutool.core.util.StrUtil;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * 
  * <p>Title: ServletUtils</p>  
  * <p>Description: 客户端工具类</p>  
  * @author yanakai@126.com  
  * @date 2019年7月28日
 */
public class ServletUtils {
	
	
	/**
     * 获取String参数
     */
    public static String getParameter(String name){
        return getRequest().getParameter(name);
    }

    /**
     * 获取String参数
     */
    public static String getParameter(String name, String defaultValue){
        return Convert.toStr(getRequest().getParameter(name), defaultValue);
    }

    /**
     * 获取Integer参数
     */
    public static Integer getParameterToInt(String name){
        return Convert.toInt(getRequest().getParameter(name));
    }

    /**
     * 获取Integer参数
     */
    public static Integer getParameterToInt(String name, Integer defaultValue){
        return Convert.toInt(getRequest().getParameter(name), defaultValue);
    }

    /**
     * 获取request
     */
    public static HttpServletRequest getRequest(){
        return getRequestAttributes().getRequest();
    }

    /**
     * 获取response
     */
    public static HttpServletResponse getResponse(){
        return getRequestAttributes().getResponse();
    }

    /**
     * 获取session
     */
    public static HttpSession getSession(){
        return getRequest().getSession();
    }

    public static ServletRequestAttributes getRequestAttributes(){
        RequestAttributes attributes = RequestContextHolder.getRequestAttributes();
        return (ServletRequestAttributes) attributes;
    }

    /**
     * 将字符串渲染到客户端
     * 
     * @param response 渲染对象
     * @param string 待渲染的字符串
     * @return null
     */
    public static String renderString(HttpServletResponse response, String string){
        try{
            response.setContentType("application/json");
            response.setCharacterEncoding("utf-8");
            response.getWriter().print(string);
        }catch (IOException e){
            e.printStackTrace();
        }
        return null;
    }

    /**
             *  是否是Ajax异步请求
     * 
     * @param request
     */
    public static boolean isAjaxRequest(HttpServletRequest request){
        String accept = request.getHeader("accept");
        if (accept != null && accept.indexOf("application/json") != -1){
            return true;
        }

        String xRequestedWith = request.getHeader("X-Requested-With");
        if (xRequestedWith != null && xRequestedWith.indexOf("XMLHttpRequest") != -1){
            return true;
        }

        String uri = request.getRequestURI();
        if (StrUtil.containsAnyIgnoreCase(uri, ".json", ".xml")){
            return true;
        }

        String ajax = request.getParameter("__ajax");
        if (StrUtil.containsAnyIgnoreCase(ajax, "json", "xml")){
            return true;
        }

        return false;
    }
}
